Method of manufacturing packings for rotating shafts



, y c'. STEENSTRUP. METHOD 0F MANUFACTURING PACKINGS FOR ROTATING SH ly* APIPLICATION FILED SEPT. 20. i919. 1,357,739.

AFTS.

Patented Nov. 2, 1920.

I inventor: Christianteenstrub I-l is Attorn e9.

UNITED sTATEs PATENT OFFICE.

CHRISTIAN S-TEENSTRUP, 0F SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

METHOD OF MANUFACTURING PACKINGS FOR ROTATING SHAFTS.

Specication of Letters Patent.

Patented Nov. 2, 1920.

Application led September 20, 1919. Serial No. 325,196.

T o all 'whom -z't may concem Be it known that I, CHRISTIAN STEEN-s'rRUr, a citizen of the Fnited States, residing at Schenectady, in thecounty of Schenectady, State of New York, have invented certain new anduseful Improvements in Methods of Manufacturing Packings for RotatingShafts, of which the following is a specification.

The present invention relates to packings, such as are used to preventleakage betweenl a rotating shaft and an adjacent wall through which theshaft passes and `particularly to packings of the type comprising aplurality of thin-edged, annular teeth or projections which are carriedby the rotating shaft and the adjacent wall or which are carried by thewall and pack against the outer surface of the shaft. Packings of thischaracter are well-known and are termed labyrinth or cellular packings.

The object of the present invention is to provide an improved method ofmanufacturing packings of. the type referred to, which is economical tocarry out. and by means of which a large number of the thingated stripedged, annular teeth or projections may be rovided in a comparativelyshort space.

A further object. of the invention is to provide an improved method inwhich all the operations are of a simple character and can be carriedout by the ordinary workman without the use of special tools. whereby hihly sllled labor will not be required.

or a consideration of what I believe to be novel and my invention,attention is directed to the accompanying description and the claimsappended thereto.

Inthe accompanying drawing, Figures 1 to 8 inclusive illustratesuccessive steps in carrying out the method and Fig.` 9 shows a.modification.

In carrying out y improvedimethod I take a strip of corrugated met-al 15as shown in Fig. 1 and fasten it to a fiat sheet of meta-l of suitablelength. width and thickness as shown at 16 in Fig. 2. The corru- 15 maybe made in any suitable thin material and the corrudepth depending onthe radial depth which it is desired' the teeth shall have in thefinished packing. Likewise the corrugationsv will be of such width as togive the desired spacing of the teeth.

mannery from gatlons will have a.

pack against the surface of` formed is removed from diametric-allyopposite the meety Such corrugated strips can be very readily made as iswell-understood. The corrugated st'rip 15 is preferably fastened to themetal sheet 16 by brazing or welding and after being fastened into placethe sheet 16 with the corrugated strip 15 fastened thereon will have theappearance in end elevation as shown in Fig. 3. The side edges of sheet16 are beveled as indicated at 17 so that such sheetmay be attached to aholder by a dovetail connection as will be referred to hereinafter.After the corrugated strip 15 has been fastened to sheet 16 a section ofit is then wound about a former 18 of suitable diameter and cut off soas to form a tube of the same diameter as the former. (See Fig. i). Thetube will thus comprise a backing piece which is formed from sheet 16with the corrugated strip 15 fastened on its outer surface. eveled edges17 will be located at the two ends of the tube. The tube thus former 18and split at a polnting point of the two edges of the section so as toform the tube into two halves as indicated in Fig. 5 and as shown insection in Fi 6. The outer surface of the corrugations is t ien groundoff leaving projecting rings or teeth as shown at 19in Fig. 7, suchrings or teeth being formed from the radially extending parts of thecorrugated strip. The respective halves of the tube are then mounted ina suitable holder 2O as shown in Fig. 8 which holder in turn is mountedon the shaft 21 which is`to carry the packing rings. The holder 20 maybe made in two halves and is providedwith a circumferential slot of thewidth of the tube and having undercut edges to receive the beveled end17 of the tube. This forms a very firm mounting for the tube and packlngteeth 19. In Fig. 8, 22 indicates .the adjacent stationary wall betweenwhich and the shaft the packing is arranged.

In Fig. 9 I have shown a modified form withA the corrugated vstrip 15 onthe inside instead of on the outside.

By the foregoing method a. packing can be made having the teeth -orannular projections as close together as is found desirable; also verythin material may be readily used in making the corrugatedstrip and itcan be easily handled while being fastened to the backing she'et sincethe corrugations stifen the strip and prevent bending of thecorrugations crosswise of the strip. As is well recognized, it isdesirable that the packing teeth or project-ions be made from as thinmaterial as possible.

The method also results in a packing in which the packing' teeth arefirmly anchored or fixed to the part carrying them, and in a packingwhich can be easily replaced or repaired in case it is damaged.Furthermore, the same strip material, that is, the sheet 16 with acorrugated strip 15 fastened thereto as shown in Fig. 3 can be lnadeinto packings of any desired diameter and for being carried by the shaftas shown in iF ig. 8 or by the surroimding wall as shown in l? ig. 9; orif desired by both .the shaft and the surrounding Wall with the packingteeth interleaving as is well under-v stood.

ln accordance with the provisions of the patent statutes..- l havedescribed mv improved method in connection 1With the steps that l nowprefer for carrying it out, but it `will be understood that the specihcsteps described are only illustrative and that the method may be carriedout by such steps as come WithinF the terms of the appended claims.

What l claim as new and desire to secure by Letters Patent of the UnitedStates, is

1. rl`he method of manufacturing a packing element comprising aplurality of annular, radially extending teeth which comprises fasteninga strip of corrugated metal toa holder and then removing the outerportion of the corrugation to leave outwardly projecting teeth.

2. rlhe method of manufacturing a packing element comprising a pluralityof annular, radially extending teeth which comprises fastening a stripof corrugated metal to a holder and removing those portions of thecorrugations which are parallel to the holder and spaced therefrom.

3. 'lhe method of manufacturing a packa tube with ing element whichcomprises fastening a strip of corrugated material on a flat -hackingsheet, bending the backing sheet to form a tube with thecorrugations onone side thereof, and removing from the free side of the corrugatedmaterial that portion of it which extends parallel to the backing sheet.

4. The method of manufacturing a packing element which comprisesfastening a strip of corrugated' material on a dat backing sheet,bending the backing sheet to form the corrugations on one side thereof,removing from the free side of the corrugated material that portion ofit which extends parallel to the backing sheet and fastening the backingsheet to a supporting holder.

5. llhe method of manufacturing a packing element which comprisesfastenin a strip of corrugated material on a flat backing sheet.,bending the backing sheet to form a tube with the corrugations on oneside thereof, removing from the free side of the corrugated materialthat portion of it which extends parallel to the ba .n g sheet,fastening the backing sheet to a supporting holder, and mount-ing thesupporting holder on the part which is to carry the packing.

6. 'l`he method of manufacturing a packing element Awhich comprisesproviding a tube having a strip of corrugated material fastened on onesurface thereof and grindin od the corrugations until only the radialportions remaln..

'i'. 'l`he method of manufacturing a packing element which comprisesproviding `a tube having a strip of corrugated material fastened on onesurface thereof, grindin od the corrugations until only the radialportions remain and mounting the tube on a part which is to carry it.

8. 'lhe method of manufacturing a. packing element which comprises faststrip of corrugated material on a flat backing sheet having bevelededges, backing sheet to form a tube, olf the corrugations until only theradial portions of them remain, and mounting said tube on av holder withthe beveled ends engaging undercut grooves in said holder.

ln witness whereof, l have hereunto setv my hand this lmh day ofSeptember, 1919.

' `"refieran s'rnnus'rnur.

bending the

